import { and, asc, eq, inArray } from "drizzle-orm";
import type { AppDatabase } from "../database-context.js";
import { distributionBoards } from "../schema/distribution-boards.js";

export function assertBoardsAreNotReferencedAsFeeders(
  database: AppDatabase,
  projectId: string,
  distributionBoardIds: string[]
) {
  if (distributionBoardIds.length === 0) return;
  const dependent = database
    .select({
      name: distributionBoards.name,
      boardNumber: distributionBoards.boardNumber,
    })
    .from(distributionBoards)
    .where(
      and(
        eq(distributionBoards.projectId, projectId),
        inArray(
          distributionBoards.feedingDistributionBoardId,
          [...new Set(distributionBoardIds)]
        )
      )
    )
    .orderBy(asc(distributionBoards.boardNumber), asc(distributionBoards.name))
    .limit(1)
    .get();
  if (dependent) throwFeedingReferenceError(dependent);
}

export function assertCircuitsAreNotReferencedAsFeeders(
  database: AppDatabase,
  projectId: string,
  circuitIds: string[]
) {
  if (circuitIds.length === 0) return;
  const dependent = database
    .select({
      name: distributionBoards.name,
      boardNumber: distributionBoards.boardNumber,
    })
    .from(distributionBoards)
    .where(
      and(
        eq(distributionBoards.projectId, projectId),
        inArray(
          distributionBoards.feedingCircuitId,
          [...new Set(circuitIds)]
        )
      )
    )
    .orderBy(asc(distributionBoards.boardNumber), asc(distributionBoards.name))
    .limit(1)
    .get();
  if (dependent) throwFeedingReferenceError(dependent);
}

function throwFeedingReferenceError(dependent: {
  name: string;
  boardNumber: string | null;
}): never {
  const label = dependent.boardNumber ?? dependent.name;
  throw new Error(`Speist ${label} – erst Einspeisung ändern.`);
}